Many bigger projects, especially stuff in the circles near the Cloud Native Computing Foundation, have distros of open projects.
Just want to run OpenStack and Kubernetes, or want to contribute changes? Get it from upstream, work with upstream.
Want an SLA, an SBOM, support etc? Buy a distro from a commercial vendor. Upstream will get fixes in the pace that works for upstream and distros provide whatever their clients want to pay for.
To call it a product distro is appropriate, because community OS distros like Debian and Fedora do this too, they don't just package things, they also track bugs and act as a first-level support line, they backport fixes, etc, and when appropriate it all bubbles up to upstream, which can stay focused on the latest version and the upstream product vision. And of course commercial distros like RHEL do this too, or perhaps even more so, and are definitely willing to sell the service of doing so.